What are the separators in the original data?
If it's a space then ;
Select what's to be modified
Open Advanced Find
Turn on use Wildcards
In the Find What Box type ([0-9]) (Where the smiley is a space or whatever is after the number)
In the replace box type ^13\1
This replaces all numbers followed by a space into the number followed by a carriage return.

Optionally to save your sanity cause word regex sucks use a proper editor